Fermi polaron laser in two-dimensional semiconductors

• URL: http://arxiv.org/abs/2103.14040v2
• Date: Wed, 20 Apr 2022 08:39:47 GMT
• Title: Fermi polaron laser in two-dimensional semiconductors
• Authors: Tomasz Wasak, Falko Pientka, Francesco Piazza
• Abstract summary: We study the relaxation dynamics of driven, two-dimensional semiconductors, where electrons dress optically pumped excitons to form Fermi-polaron branches. As the coherent peak is at the edge of the light-cone and not at the center, the many-body dressing of excitons can reduce the linewidth below the limit set by the exciton nonradiative lifetime.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the relaxation dynamics of driven, two-dimensional semiconductors, where itinerant electrons dress optically pumped excitons to form two Fermi-polaron branches. Repulsive polarons excited around zero momentum quickly decay to the attractive branch at high momentum. Collisions with electrons subsequently lead to a slower relaxation of attractive polarons, which accumulate at the edge of the light-cone around zero momentum where the radiative loss dominates. The bosonic nature of exciton polarons enables stimulated scattering, which results in a lasing transition at higher pump power. The latter is characterized by a superlinear increase of light emission as well as extended spatiotemporal coherence. As the coherent peak is at the edge of the light-cone and not at the center, the many-body dressing of excitons can reduce the linewidth below the limit set by the exciton nonradiative lifetime.

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